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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '594ea743210b7892694b2b7e671029b34a8feb3804881c05dd255bf57b18500c' 
  AND token = 'MtJFvC1uqw4zpp0zsG4b6Go3k7dqq9FBas7ntBUgeec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}